F01L 13/0021
By modification of rocker arm ratio
Official title: {by modification of rocker arm ratio}
F01L13/0021 (By modification of rocker arm ratio) appears on 662 US grants and 607 published applications in this corpus.
Search patents in F01L- Granted patents
- 662
- Published applications
- 607
- Assignees
- 139
- Inventors
- 739
- Latest grant
- 15 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 5 | 0 |
| 1985 | 7 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 7 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 11 | 0 |
| 2001 | 7 | 11 |
| 2002 | 27 | 33 |
| 2003 | 29 | 30 |
| 2004 | 26 | 27 |
| 2005 | 23 | 41 |
| 2006 | 38 | 46 |
| 2007 | 39 | 47 |
| 2008 | 43 | 53 |
| 2009 | 29 | 61 |
| 2010 | 43 | 39 |
| 2011 | 39 | 28 |
| 2012 | 38 | 19 |
| 2013 | 30 | 25 |
| 2014 | 26 | 21 |
| 2015 | 33 | 26 |
| 2016 | 11 | 23 |
| 2017 | 24 | 30 |
| 2018 | 25 | 17 |
| 2019 | 17 | 8 |
| 2020 | 11 | 8 |
| 2021 | 9 | 5 |
| 2022 | 3 | 3 |
| 2023 | 4 | 3 |
| 2024 | 3 | 2 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Anti-clatter engine brake and engine having same15 Apr 2025US 12,276,215 B1Deere & Company
- Valve-actuating device18 Mar 2025US 12,253,012 B2AVL List GmbH
- Rocker arm assembly with main rocker and forked auxiliary rocker24 Dec 2024US 12,173,629 B2Eaton Intelligent Power Limited
- Engine braking system26 Nov 2024US 12,152,515 B2Deere & Company
- Variable intake valve closing using through axle rocker arm16 Apr 2024US 11,959,402 B2Eaton Intelligent Power Limited
- A phase change system for opening and/or closing intake valves8 May 2025US 2025/0146429 A1PIAGGIO & C. S. p. A.
- Rocker arm assembly with main rocker and forked auxiliary rocker9 May 2024US 2024/0151167 A1Eaton Intelligent Power Limited
- Roller pin decoupling type cda system4 Apr 2024US 2024/0110493 A1Hyundai Motor Company
- Valve-actuating device31 Aug 2023US 2023/0272728 A1AVL List GmbH
- Engine braking system6 Jul 2023US 2023/0212965 A1Deere & Company
Most cited
By later US patents
- Motor/generator unit applicable to automotive vehicle81US 6,184,603 B2Unisia Jecs Corporation · 2001
- Engine valve control mechanism78US 4,762,096 AEaton Corporation · 1988
- Variable valve drive mechanism and intake air amount control apparatus of internal combustion engine59US 6,425,357 B2Toyota Jidosha Kabushiki Kaisha · 2002
- Variable valve timing for four-stroke engines57US 4,572,118 A1986
- Dual intake valve type internal combustion engine55US 4,285,310 AToyota Jidosha Kogyo Kabushiki Kaisha · 1981